Staedtler Universal Lumocolor permanent , M, BLUE 317-3 Line width 1 mmBlue Staedtler Lumocolor PERMANENT OHP MARKER PEN CD/DVD MARKER BLUE Ink - Single Pen Medium Nib = 1.0mm Line Simply the Best Permanent Marker Pen for OHP, CDs, DVDs & Just about any other Surface Suitable for Huge Range of Surfaces: Marks Glass, Wood, Plastics, Metal, Ceramics, OHP